Sliding doors with cam guides for coplanar closing, particularly for pieces of furniture or similars

ABSTRACT

Sliding doors, e.g., for pieces of furniture, particularly of the kind with two shutters and reduced height, having coplanar closing and opening by overlapping of the shutters. Support and translation of each shutter is provided by a respective clamp placed on the edge of the outer side, the clamp being linked to a pair of little carriages that can slide transversally with respect to the same shutter, because they are supported and guided by a respective carriage, which in turn can slide longitudinally along the edge of an opening, the respective carriage being led by a rail and control tracks, and engaged by a loose roller that constrains the respective carriage into a couple of longitudinal cams or grooves.

The present invention relates to a new embodiment of sliding doors forpieces of furniture or similar decorative elements, particularly of thekind with two shutters and reduced height, having a coplanar closing andthe opening made possible by making the doors slide over each other.

Main feature of this invention is that of providing the support and thetranslation or movement of each sliding door by means of a respectiveclamp placed on the edge of the outer side, each clamp being linked to apair of little carriages that can slide transversally with respect tothe same door because they are supported and guided by a respectivecarriage, that, on its turn, can slide longitudinally along the edge ofthe opening to close, it being guided by a rail and by other controltracks and being forced by its loose roller that is engaged in one ofthe two rails or longitudinal cams, which are supported and beside thesupporting and sliding rail, to bring one of the two doors to slide overthe other during the process of opening and to bring the same door inline with the one at rest during the process of closing.

As an alternative to the usual doors with pivots, some embodiments ofsliding doors that can be applied to wardrobes and pieces of furniturein general and to fittings or any other application of closing elementsrequiring a reduced space in their open position are well-known.

Generally this kind of doors comprise two or more doors, each of themhaving clamps with rolling means guided by a track made of an upperguide and a lower guide respectively applied to the flloor and to theceiling of the opening to close, a track of one door being beside andparallel to the track of the other door.

The sliding of the shutters in this kind of doors occurs then onparallel planes placed one beside the other, achieving the closing ofthe opening by alignment or partial overlapping of the edges of oneshutter on the edges of the other shutter and with the opposite edges ofboth the shutters against the edges or the shoulders of the opening toclose.

The unaesthetic feature of the sliding doors which are placed during theclosing on two different planes, even if they are parallel and notspaced too much apart from each other, in particular with regard topieces of furniture where aesthetic is very important, has induced theexperts in the field to search for new solutions that provide thecoplanarity of the two shutters during the closing still assuring theiroverlapping during the opening.

According to this known technique, the coplanarity of the shuttersduring the closing is achieved, even if achieved by means of differentand more or less complex means, by providing for each shutter a phase ofdragging along the respective parallel tracks and a phase of thrust orpressure for its translation in the bottom contiguous track, theopposite end of which already supports and guides the other shutter, towhich the moving shutter has to come into line.

The Italian patent No. 1.208.152 accomplishes in fact the task of thecomplanarity due to a dragging device that overcomes also the thrustphase, since only by means of the traction the shutter is brought tochange the track and till now it seems to be the most easy and effectivesolution among the proposed ones, particularly in solutions for slidingdoors for pieces of furniture, since it is characterized by the factthat for each shutter a pair of guiding rails is provided by means ofproper clamps and respective sliding elements, each of said pair ofsliding rails including a straight front guide and a second back guidewith bended extremity, while the first guide is provided with a partthat parts or splits orthogonally and that is turned towards said secondguide to allow the translation of corresponding sliding elements of therelative shutter by simple translation of the shutter to be moved.

Anyway, also the relative structural simplicity of the solution forsliding doors proposed by the mentioned patent has revealed a certaincomplexity during the production and the assembling as well as a certainbulky structure for the support and the translation of the doors.

Particularly, it has been found out that the overall dimensions of theclampings and of the lower rails causes lack of use of the piece offurniture where these sliding doors are applied. It is an object of thisinvention to provide sliding doors, particularly for high quality piecesof furniture, that achieve the task of coplanarity of their shuttersduring the closing or closed state besides the obvious overlapping ofboth sides of the piece of furniture during the opening of the samepiece of furniture by simply dragging any of its shutter without addingany phase of thrust, since the translated shutter goes automatically byitself to the same plane of the still shutter at rest during theclosing, achieving this movement without changing supporting track ortranslation guide.

Another object of this invention is to provide sliding doors having asimple structure, an easy assembling and functioning of the translationsystem still assuring the best overlapping during the opening andcoplanarity during the closing of the shutters.

Further object of this invention is that of providing sliding doors thathave a translation or movement, overlapping and coplanarity system withreduced overall dimensions or anyway such that it weighs upon the usablevolume of the piece of furniture to use only in the least and in theleast bulky way.

Last but not least object of this invention is that of beingadvantageous, in case of shutters being not very high, for theapplication to sliding doors having a proportional greater length orwidth of the opening.

These and other objects are perfectly achieved by the present inventionas it can be inferred by the following description of one of itsembodiment being purely indicative and not limiting, illustrated alsowith the help of 23 schematic drawings represented in the attached eightsheets in which:

FIG. 1 shows a front vertical view of a casual shape of a piece offurniture, to which a pair of sliding doors are to be applied, saidsliding doors closing and opening its suspended space, it beingillustrated with the only application of the tracks for the longitudinalsliding of the shutters and the application of the longitudinal supportthat hold the upper guide of said track;

FIG. 2 shows a transparent top view of the same piece of furniture ofFIG. 1 highlighting the position and the shape of the double cam upperguide and of its support;

FIG. 3 shows a transparent lateral view of the same piece of furnitureof FIG. 1 highlighting the position of the two guides of the track andof the support that holds the upper guide;

FIG. 4 shows a front view only of the double cam upper guide applied tothe piece of furniture of FIG. 1;

FIG. 5 shows a top view of the double cam upper guide of FIG. 4;

FIG. 6 shows a cross and enlarged view according to the plan VI-VI ofthe double cam guide of FIG. 5;

FIG. 7 shows a front view of the profile of lower linear guide embeddedon the bottom or floor of the opening to close of the piece of furnitureof FIG. 1;

FIG. 8 shows a cross and enlarged view according to the plan VIII-VIIIof the profile of lower guide of FIG. 7;

FIG. 9 shows a cross sectional view of one of the two sliding shuttersincluding its clamp for the linking to the translation and coplanaritydevice as in FIGS. 4 to 6 and an elbow bar for the transmission of theguide to the lower slide of FIGS. 7 and 8;

FIG. 10 shows a front and overturned view of the longitudinal carriagethat is applied indicatively on the centre line of the upper side of theshutter to support and translate, according to what above specified, itbeing intended to slide longitudinally in proper seats of the support ofthe guides of FIG. 1 and it being provided with a little carriage thatcan translate axially with respect to said carriage, thus translatingtransversally with respect to the same guides of FIG. 1;

FIG. 11 shows a top view of the same carriage of FIG. 10;

FIG. 12 shows a side view of the same carriage of FIG. 10;

FIG. 13 shows a front view of the longitudinal carriage applied to theupper top of the side of the shutter to support and translate accordingwhat specified above, it being intended to slide longitudinally intoproper seats of the supports of the guides of FIG. 1 and it beingprovided with a carriage that can translate axially with respect to saidcarriage, thus translating transversally with respect to the same guidesof FIG. 1;

FIG. 14 shows a top view of the same carriage of FIG. 13;

FIG. 15 shows a side view of the same carriage of FIG. 13;

FIG. 16 shows a front transparent view of a part of the piece offurniture of FIG. 1 including the guides, clamps and other accessoriesrequired for the opening translation and the coplanar closing of theright shutter of the same piece of furniture;

FIG. 17 shows a top and transparent view of the same part of piece offurniture of FIG. 16, the right shutter being illustrated in itsordinary closed position on the space of the piece of furniture of FIG.1;

FIG. 18 shows a side view of the same part of piece of furniture ofFIGS. 16 and 17;

FIG. 19 shows a top view similar to that of FIG. 17 but including allthe accessories required for the opening and the closing of the rightshutter of the piece of furniture of FIG. 1, said right shutter beingrepresented in any of the positions of opening or closing of the spaceof the piece of furniture of FIG. 1;

FIG. 20 shows a top view similar to the view of FIG. 19, the rightshutter of the piece of furniture of FIG. 1 being represented already inphase or state of overlapping on the left shutter for the final part ofthe opening of the same piece of furniture;

FIG. 21 shows a front view of the same piece of furniture of FIG. 1completed with the accessories for the movement of its sliding doorsaccording to the invention;

FIG. 22 shows a top view of the same piece of furniture of FIG. 21, itbeing represented with the sliding doors already closed and coplanary;

FIG. 23 shows a top view of the same piece of furniture of FIGS. 21 and22.

In all the drawings same details are indicated by the same referencenumbers.

According to the embodiment illustrated in the different drawings of theattached drawings, a piece of furniture M of any shape has an opening orspace V with the bottom F and ceiling S and is closed with a pair ofsliding doors 1 a and 1 b being particularly characterized by theirheight relative to their greater width.

For a better understanding, the description will refer to the movementof the right shutter 1 b, wherein it is clear that the opposite leftshutter la is provided in an identical and perfectly symmetricalmovement system, acting on common guides and supports.

Each shutter 1 a and 1 b is linked to the short side 2′ of an angularclamp 2 (cf. FIG. 9), which is fixed on its opposite and long side 2″ toa pair of carriages 3 a and 3 b applied to the respective longitudinalcarriages 4 a and 4 b as specified below.

Said clamp 2 is located on the upper edge of each shutter 1 a and 1 bnear its corner, the outer side of the same shutter 1 being fixedtherein by means of screws 1 c or any other known device for a steadylinkage, and it has such a length to steadily join or link the twotransversal carriages 3 a and 3 b of each shutter 1.

As already mentioned, the carriages 3 a and 3 b, respectively, arelinked to the long horizontal side 2″ of the clamp 2 (cf. FIG. 9) ofeach shutter 1, said carriages 3 a and 3 b allowing a relativetranslation of such clamp 2 in the direction of the depth of the pieceof furniture M, moving also the respective shutter 1, to which saidclamp 2 is linked.

The movement in depth of the carriage 3 a applied to the extremity ofthe shutter 1 b by means of the clamp 2 is possible since said carriage3 a can slide by means of little rollers 31 along proper tracks 41 of alongitudinal carriage 4 a as it can be inferred from FIGS. 13, 14 and15.

Said longitudinal carriage 4 a is substantially made from a section barwith the mentioned lateral tracks 41 and with an extremity provided witha pivot 42 with loose pulley 43 and the opposite extremity provided witha pivot 44 with bearing or loose wheel 45.

The carriage 3 a engages its rollers 31 for the sliding along thecarriage 4 a also by means of a plate 32 that contains its hubs, besideshaving a suspended and projecting side 33, to which a pivot 34 of aloose roller 35 is linked.

The carriage 4 a is completed by the presence of a loose roller 46coaxial to the pulley 43 and supported by a proper clamp 47 applied tothe extremity of the same carriage 4 a.

The positions and the functions of the pulley 43 and of the looserollers 35, 45 and 46 will be illustrated in detail below, after thedescription of the different components of the device at issue.

The movement in depth of the carriage 3 b (cf. FIGS. 10-12) applied onthe centre line of the shutter 1 b and linked to the already mentionedclamp 2 is possible since the carriage can slide by means of littlerollers 31 along proper tracks 41 of a longitudinal carriage 4 b as itcan be inferred from FIGS. 10, 11 and 12.

Said longitudinal carriage 4 b is very similar to the contiguouscarriage 4 a, it being made from a section bar with similar tracks 41having an extremity 42 provided with loose pulley 43 and the oppositeextremity provided with a pivot 44 with bearing or loose roller 45.

Like the carriage 3 a also the carriage 3 b engages its little rollers31 for the sliding along the tracks 41 of the carriage 4 b also by meansof a plate 32 that contains its hubs, besides having a suspended andprojecting side 33, on which the pivot 34 of a loose roller 35 islinked.

A shaped plate 36 is fixed on the inner side of the carriage 4 b, sothat the end of an elastic mean, for example a traction helical spring37 can be fixed thereto having its opposite end engaged in a pivot 38supported and fixed to the projecting end 33 of the control plate 32.

The presence of the elastic means 37 assures the running back of thecarriage 3 b, when the latter is forced to move along the tracks 41 ofthe carriage 4 b.

The carriage 4 b is different from the carriage 4 a because no looseroller 46 nor supporting clamp 47 is therein provided.

The longitudinal carriages 4 a and 4 b of the right shutter 1 b of thepiece of furniture M at issue are identical to the correspondingcarriages of the other shutter 1 a, because they are supported and canmove in the direction of the length of the piece of furniture M by meansof a shape or profile 5 placed along the whole length of the piece offurniture M and supported by proper bosses or clamps 51 fixed to, forexample, the sides of the same piece of furniture M.

With particular reference to FIG. 9, it can be inferred that the shape5, besides having a ribbed structure to assure its greatest resistance,has also a particular front rail 59 for the sliding of the pulley 43both of the outer carriage 4 a and of the inner carriage 4 b.

The shape 5 has a control track 58 opposite to said rail 59 and isintended for the sliding of the loose wheel 46 of the carriage 4 a , sothat also under irregular stress on the shutter 1 b, said track 58assures the perfect longitudinal running of the carriage 4 a.

The mentioned shape 5 then has got a sliding track 53 and a shoulder 54that supports and makes the loose roller 45 slide, which assurestogether with the guide pulley 43 the support and the longitudinalmovement of the carriage 4 a as well as of the carriage 4 b for theshifting of the shutters 1 along the whole length of the piece offurniture M.

The same shape 5 then has got a proper opening 55 able to house and fixthe double cam or upper guide 6 that regulates the overlapping of thetwo shutters during the opening and assures the coplanarity during theclosing, as below better specified.

With particular reference to FIGS. 4, 5 and 6, it can be inferred thatthe upper guide or double cam 6 is substantially formed by a rigid bodyhaving fundamentally the same length as the opening V to close and so ofthe shape 5 that houses and supports it also by means of the lateralsupports 51.

Said body 6 shows a groove 61 substantially linear and with ends 61 aand 61 b bended symmetrically and in a specular way with a pretty sharpradius, in the direction opposite to the side of the sliding shutters ordoors 1, its length being, by way of example, lightly longer than 2/4 ofthe total length of the guide 6.

A second groove 62, indicated with corresponding section but with almostthe same total length as the entire guide 6, is accomplished near theouter edge with extremities 62 a and 62 b bended symmetrically and in aspecular way with a very wide radius in the direction opposite to theside of the sliding shutters or doors 1.

The dimensions of the grooves 61 and 62 of the shape of the guide 6 areable to contain and guide the loose rollers 35 applied to the coveringplate 33 of the transversally movable carriages 3 a and 3 b of thelongitudinally movable carriages 4 a and 4 b.

On the base of what is till now described and with reference to theshutter 1 b till now taken in exam, it can be inferred that this shutter1 b is fundamentally supported and moved by the clamp 2 that links andconnects the pair of transversal carriages 3 a and 3 b as well as theirrespective longitudinal carriages 4 a and 4 b.

Nevertheless, in order to avoid that this shutter 1 b can swing andunhinge the guides and the supports till now considered, also thepresence of a lower guide 70 is provided, which, like represented inFIGS. 7 and 8, has got a section shape of guide 70 with opening 71,which is preferentially embedded on the bottom or floor F of the openingV to be closed, and which is intended as being linear along the wholelength of this opening V.

Inside said lower guide section shape 7 is housed the end 72 of an elbowtransmission shaft 73 (cf. FIG. 9), the opposite end 74 of which isprovided with a loose roller 75 housed in an opening 57 of thesupporting shape 5 for the double cam or guide 6 as well as for thecarriages 3 a and 3 b and carriages 4 a and 4 b. In this way, themovement of the shutter 1 b remains perfectly balanced.

As illustrated below, the movement of the sliding doors implies thattheir translation is not only linear but also inclined and relativelyhinges on the pivot 35 of the groove 62 b, for which the presence of theelbow transmission shaft 73, which, being linked to the shutter 1 bymeans of the supports 76, distributes the rotation and hinging stress tothe whole shutter, avoiding dangerous and fatiguing distortions betweenthe upper control part and the lower dragged part of the shutter 1.

On the base of what is till now described and with particular referenceto the FIGS. 17, 19 and 20, the functioning of the components which aretill now described and the achievement of the above mentioned objectsare summarized below with the consideration that, as already specified,both the shutters 1 are perfectly symmetrical and perfectly symmetricalworked.

Starting from the coplanar and closed position of the shutters 1 (cf.FIG. 17), the displacement and opening of the shutter 1 b to reach thecorresponding part of the opening V is supposed.

In the starting situation of FIG. 17, the shutter 1 b is engaged in theclosed position, because the carriages 3 a and 3 b are forced to be intheir rest position towards the respective sliding wheel 45 because ofthe fact that their guide rollers 35 are engaged in the most rear point61 a and 61 b of the respective grooves or cams 61 and 62 of the guide6.

Dragging the shutter 1 b to the left to cause the opening of the spaceV, also the contemporary movement of the clamp 2 towards the centre ofthe piece of furniture M with consequent longitudinal translation of thepair of carriages 4 a and 4 b as well as of the respective carriages 3 aand 3 b is caused, as illustrated in FIG. 19.

Said longitudinal translation of the carriages 4 a and 4 b determinesthen also a differentiated transversal translation of the respectivecarriages 3 a and 3 b, which is minimal for the carriage 3 a and largerfor the carriage 3 b, because of the different widths of the camber ofends 61 b and 62 b of the cams or grooves of guide 61 and 62, in whichthe respective rollers 35 of the same carriages 3 a and 3 b are placed.

A different transversal running of the carriages 3 a and 3 b on therespective carriages 4 a and 4 b forces the clamp 2 to tilt with partialhinging action on the roller 35 of the cam 62 b, and the shutter 1 blinked to it to bend, causing so a wide opening of this shutter 1 b withrespect to the sliding rail 59, such as to allow this shutter 1 b tosurmount and overlap the shutter 1 a, which remains still in its closedposition.

The inclination of the clamp 2 caused by the mentioned difference ofpositions of the carriages 3 a and 3 b along the bended sections 61 band 62 b of the guides 61 and 62 is made possible by the fact that thepulley 43 shows a sliding groove on the rail 59, which is verycountersunk and so does not bring to any slipping off the pulley, evenwhen it is forced to rotate on the same rail 51 in a position lightlytilted on the axis of the longitudinal guide.

Continuing with the opening traction of the shutter 1 b, the latter goesbeyond the bended sections of the cams 61 and 62 to move with thecarriages 4 a and 4 b and so with the rollers 35 of the respectivecarriages 3 a and 3 b to the straight and parallel sections of the samecams 61 and 62, as represented in FIG. 20.

Going beyond the bended sections 61 b and 62 b of the grooves 61 and 62causes the restoration of the usual rest conditions of the carriages 3 aand 3 b, which is also supported by the running back action of theelastic means 37 present on the carriage 3 b, therefore, the guiderollers 35 being engaged along the straight and parallel sections of thesame grooves 61 and 62, also the shutter 1 b comes back to its positionstraight and parallel to the position of the shutter 1 a, overlapping bythe same distance existing between the two grooves 61 and 62.

The complete overlapping of the shutter 1 b with the shutter 1 a is thusmade possible without having to induce any thrust or change of rail,leaving the access to the right part of the space V completely free,according to one of the specified objects of the invention.

As already specified, the same functioning and the same result ispossible, in case of opening of the shutter 1 a, leaving the shutter 1 bat rest, provided that there is inversion of the traction, thecomponents till now described being identical and perfectly symmetrical.

In case of closing the open shutter 1 b, to bring it to a closedposition coplanar to the already closed shutter, it is sufficient toreverse the direction of the haulage to cause a translation of therespective clamps 2 with the corresponding carriages 3 a and 3 b, therollers 35 of which are forced to slide into the bended portions 61 band 62 b of the grooves 61 and 62 to cause the inclination of the movingshutter 1 b, until it has completely come back to the same plane as theother shutter 1 a, i.e. to the position of complete closing, accordingto another of the above mentioned objects.

Seen the inclination of the clamp 2 along the track, in which the guiderollers 35 of the carriages 3 a and 3 b go along the bended portion ofthe grooves 61 and 62, it is clear that the same shutter 1 has to beprovided with a shaft 73 for the transmission of the movement, saidshaft 73 being elbow shaped, since such a shape allows to distribute thestress of light torsion also to the lower part of the same shutter,which is led by the end 72 in the groove 71 of the lower profile 70,thus assuring the steadiness of the sliding door, besides reducing atleast the haulage stress, according to one of the specified objects.

The embodiment till now illustrated is without any devices for thechanging of rail or any thrust system to combine with or alternate tothe hauling, it being furthermore very simple and safe during the layingand the working or during the ordinary maintenance, according to otherspecified objects.

Of course, the embodiment till now described can be also differentlyaccomplished, as already mentioned. The possibility of changing oradjusting the length of the guides 61 and 62 of the guide cam 6 withrespect to the foreseeable running of the shutters 1 to open or close onthe piece of furniture M is given by way of example only.

It is also possible to reverse the direction of the control side tillnow described, by placing it on the basis or bottom F of the piece offurniture M to be closed, in particular by placing its components in alittle space below the opening to be closed, as, for example, alreadyaccomplished by the solution of the mentioned patent, but having theadvantage of a great reduction of the overall dimensions and asimplification of the components.

According the latter solution, the same carriages 4 a and 4 b and thesame carriages 3 a and 3 b of each shutter 1 a and 1 b have to slidealong a supporting shape 5, which is differently shaped to supportdirectly the weight of the sliding doors 1 as well as to house the guidecam 6, as well as an adjustment of the angular shape will have to beprovided also for the clamp 2, which links the carriages 3 a and 3 b tothe shutter 1 a or 1 b to translate.

It is also possible to replace the lower straight guide 70 with a guidethat has the same double cam shape of the upper guide 6, allowing thusthe elimination of the elbow shape of the transmission shaft 73, as wellas it is possible to apply a double cam on the ceiling S in case ofapplication of the control system on the base of the shutter 1, thuseliminating also shaft 73 of distribution and of the shutter during theinclination.

It is then possible to replace the only clamp 2 with a clamp that linkseach carriage 3 a and 3 b to the shutter to support, as well as theguide 6 can be supported by the piece of furniture M in a independentway with respect to the shape 5 that includes the rail 59 and the otherspecified guides.

These and other changings or adjustments of the movement of longitudinalcarriages 4 a and 4 b matched with the movement of the carriages 3 a and3 b led by particular cams 61 and 62 are anyway belonging to theoriginality of the invention to protect.

1-16. (canceled)
 17. A sliding door, comprising: a cam guide; at leastone shutter; a clamp configured to be fixed to said at least oneshutter; a pair of first carriages; and a pair of second carriages, saidsecond carriages being supported and guided by a rail, which is realizedby a profile, wherein the profile is placed along a length of an openingwhich is to be opened and closed by said sliding door, for translatingsaid second carriages along said opening; wherein said clamp isconfigured to link said at least one shutter to said pair of firstcarriages, each one of said first carriages is translatablelongitudinally along its respective one of said second carriages and istranslatable relatively to the other of said first carriages, and saidcam guide comprises grooves into each of which a roller of said firstcarriages respectively can engage such that each roller is movablelongitudinally and transversally to said rail.
 18. A sliding dooraccording to claim 17, wherein for longitudinal translation of the firstcarriages along tracks of their respective longitudinal secondcarriages, said shutter is translatable transversally with respect tothe axis of the rail, which is orientated longitudinally to the openingto be closed and opened.
 19. A sliding door according to claim 17,wherein said shutter is linked to the pair of first carriages by one ormore clamps, which bring the at least one shutter for accomplishingmovement resulting from the longitudinal translation of the secondcarriages along the rail matched with the transversal movement of thefirst carriages as an effect of their respective engagement with thegrooves.
 20. A sliding door according to claim 19, wherein each one ofsaid first carriages includes rollers or another sliding system, forbeing translatable along the tracks of said second carriages whichrespectively include a pulley for sliding along the rail for support andthe translation of the at least one shutter.
 21. A sliding dooraccording to claim 20, wherein one of said first carriages is placedlaterally to said at least one shutter, so that its guide roller can behoused and can slide to bended ends of a long groove of said grooves ofthe guide cam.
 22. A sliding door according to claim 20, wherein one ofsaid first carriages is placed on the center line of a longitudinal sideof the at least one shutter, so that its guide roller can be housed andcan slide to bended ends of a short groove of said grooves of the guidecam.
 23. A sliding door according to claim 17, wherein one of said firstcarriages is placed respectively on an outer edge and the other one onthe center line of an upper side of the at least one shutter, said firstcarriages being steadily linked to the at least one shutter by one ormore clamps.
 24. A sliding door according to claim 17, wherein one ofsaid first carriages is placed on the outer edge and the other one onthe center line of a lower side of the at least one shutter by one ormore clamps.
 25. A sliding door according to claim 19, wherein thesecond carriages include a pulley and with a sliding wheel that slideson a track of the supporting profile, the profile including a shoulderfor acting together with the support and guide of the at least oneshutter during the translation along the rail.
 26. A sliding dooraccording to claim 20, wherein one of the pulleys of the secondcarriages includes a flaring wide enough to rotate on the rail even whenthey are lightly tilted with respect to the axis of the same rail. 27.Sliding door according to claim 20, wherein one of the second carriagesincludes a stop wheel acting as a shoulder on the track of thesupporting profile, to assure linearity of the translation of the atleast one shutter, also in case of pushes or uneven thrusts.
 28. Asliding door according to claim 17, where combining a device is combinedfor the leading and control of the wide opening of the at least oneshutter to be opened or to be closed for the respective overlapping andcoplanarity, with a guide device placed on the opposite of alongitudinal side, said opposite guide device being fundamentallyprovided for a better distribution of the stress in phase of inclinationor partial hinging of the moving at least one shutter as an effect ofthe different position of the first carriages during their translationinto the respective bended portions of the guide cam.
 29. A sliding dooraccording to claim 28, wherein an elbow-shaped transmission shaft islinked to a section of the profile for the support of the secondcarriages, by interposition of a roller that slides on the sides of anopening of the section, said elbow-shaped shaft being steadily fixed tothe shutter by supports, and an opposite extremity of the shaft beingadjusted to slide inside an opening of a guide which is placed on a sideopposite where the carriages and little carriage system are located. 30.A sliding door according to claim 28, wherein an elbow-shapedtransmission shaft has its upper extremity engaged in the opening of thesupporting profile, the upper pulley and the roller of the firstcarriage being linked to a ceiling of the opening, the oppositeextremity of the shaft being engaged in a linear guide placed on bottomof the opening.
 31. A sliding door according to claim 28, wherein thelinear guide being linked to the bottom is formed by a guide cam beingidentical and parallel to the guide cam of the ceiling, requiring only alower pivot for the sliding of the at least one shutter without havingto apply to the elbow-shaped shaft.
 32. A sliding door according toclaim 24, wherein a guide cam is provided with the ceiling of theopening that implies the at least one shutter to be guided andcontrolled by the first carriages with the second carriages beingsupported by clamps placed on the lower side of the same at least oneshutter.